Positioning:
The Yamaha TTR125 series is positioned as a highly capable and user-friendly off-road motorcycle, popular for trail riding, beginner motocross, and recreational use. Its reliability and ease of maintenance make it a favorite among younger riders and adults alike.
Competitors:
Competes with models such as the Honda CRF125F, Kawasaki KLX125, and Suzuki DR-Z125, offering a balance of performance, durability, and affordability.
Features:
Lightweight chassis, torquey air-cooled engine, reliable performance, accessible seat height (especially on LW models), ease of operation and maintenance.
Value Proposition:
This service manual provides essential information for maintaining the TTR125 in optimal condition, ensuring longevity, reliable performance, and safe operation. It empowers owners and technicians with the knowledge to perform complex repairs and routine maintenance effectively.
Primary Focus:
Service, Repair, Workshop
Scope:
Comprehensive diagnostics, maintenance, repair procedures
Estimated Page Count:
Varies by specific manual, typically 300-600 pages for this model
Type:
Service Manual / Workshop Manual
Engine:
Engine overhaul, disassembly, assembly, tuning, carburetion, lubrication, cooling, valve timing, compression testing, component diagnostics
Transmission:
Clutch, gearbox, shifting mechanism, maintenance, repair, lubrication
Chassis:
Frame, suspension (front forks, rear shock), steering, wheel bearings, swingarm, maintenance, alignment, adjustments
Brakes:
Front and rear brake systems (drum or disc, depending on specific TTR125 variant), fluid replacement, bleeding, caliper/master cylinder overhaul, pad replacement
Electrical:
Ignition system, lighting, battery, charging system (stator, rectifier), wiring diagrams, fuses, troubleshooting electrical faults
Fuel System:
Carburetor (Mikuni VM series typically), fuel tank, fuel lines, petcock, cleaning, adjustment, troubleshooting fuel delivery issues
Exhaust System:
Exhaust pipe, muffler, maintenance, inspection
Bodywork And Trim:
Seat, fenders, fuel tank cover, side panels, graphics, removal and installation
Maintenance:
Oil changes, filter replacement, chain lubrication and adjustment, air filter cleaning/replacement, spark plug replacement, brake adjustments, general inspection
Repair:
Engine rebuilds, transmission repairs, suspension component replacement, carburetor overhaul, brake caliper servicing, electrical component diagnosis and replacement
Troubleshooting:
Systematic fault finding, diagnostic charts, common problems and solutions, symptom-based diagnostics
Specifications:
Torque specifications, fluid capacities, clearances, electrical resistance values, engine performance data
Special Tools:
Identification and usage of specialized tools required for certain procedures
Depth:
Complete workshop level, suitable for professional mechanics and experienced DIY enthusiasts. Covers everything from basic checks to full engine and component overhauls.
Engine Type:
4-stroke, SOHC, 2-valve
Bore X Stroke:
Approx. 54mm x 54.5mm (verify with specific model year)
Compression Ratio:
Approx. 9.5:1 (verify with specific model year)
Cooling System:
Air-cooled
Ignition System:
CDI (Capacitor Discharge Ignition)
Horsepower:
Approx. 9.5 - 10.5 HP @ 8000 RPM (estimate, varies by tuning and year)
Torque:
Approx. 9-10 Nm @ 6500 RPM (estimate, varies by tuning and year)
Fuel Delivery:
Carburetor
Carburetor Model:
Mikuni VM20 or similar
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Approx. 1.5 US gallons (5.7 Liters)
Overall Length:
Approx. 71.5 inches (1815 mm) for TTR125, 75.6 inches (1920 mm) for TTR125LW
Overall Width:
Approx. 31.5 inches (800 mm)
Overall Height:
Approx. 43.1 inches (1095 mm) for TTR125, 44.9 inches (1140 mm) for TTR125LW
Seat Height:
Approx. 31.5 inches (800 mm) for TTR125, 33.9 inches (860 mm) for TTR125LW
Wheelbase:
Approx. 49.4 inches (1255 mm) for TTR125, 51.2 inches (1300 mm) for TTR125LW
Ground Clearance:
Approx. 10.2 inches (260 mm) for TTR125, 11.2 inches (285 mm) for TTR125LW
Dry Weight:
Approx. 179 lbs (81 kg) for TTR125, 181 lbs (82 kg) for TTR125LW
Curb Weight:
Not officially specified, but estimated based on dry weight plus fluids.
Safety Standards:
Designed for off-road use, not street-legal. Safety compliance for off-road environments.
Braking System:
Front: Drum (TTR125) or Disc (TTR125E/LW); Rear: Drum. Features engineered for controlled stopping power in off-road conditions.
Suspension System:
Front: Telescopic fork; Rear: Swingarm with monoshock. Designed to absorb impacts and maintain traction.
Lighting:
Headlight and taillight (basic, for visibility, not DOT approved).
Throttle Limiter:
Some models may have adjustable throttle stops for beginner riders.
Engine Oil Change:
Every 600 miles (1000 km) or 6 months. (Refer to manual for specific intervals and conditions).
Air Filter Cleaning:
Clean every 10-15 hours of riding or as needed in dusty conditions. Replace filter element when worn.
Spark Plug Replacement:
Inspect every 1200 miles (2000 km), replace as needed. Gap specification typically 0.6-0.7 mm.
Chain Lubrication Adjustment:
Lubricate and check tension every 300 miles (500 km) or after riding in wet conditions. Slack specification typically 20-30mm.
Valve Clearance Check:
Inspect every 3000 miles (5000 km) or 24 months. (Intake: 0.08-0.12mm; Exhaust: 0.10-0.14mm - verify with manual).
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher.
Engine Oil Capacity:
Approx. 1.0 Liters (1.1 US Qt) without filter change; Approx. 1.1 Liters (1.2 US Qt) with filter change. (Verify with manual).
Brake Fluid Type:
DOT 3 or DOT 4 (verify with manual).
Fork Oil Type:
Yamaha Fork Oil (or equivalent) SAE 10W, 0.59 L per fork leg. (Verify with manual).
Carburetor Fouling:
Can occur with infrequent use or poor fuel quality, leading to hard starting or poor running. Regular cleaning and proper storage are recommended.
Chain And Sprocket Wear:
Standard wear item for off-road bikes; requires regular inspection, lubrication, and timely replacement.
Suspension Seals:
Fork seals can leak over time, especially under heavy use. Regular inspection and replacement are necessary.
Throttle Cable Adjustment:
Can stretch over time, affecting throttle response. Requires periodic adjustment.
Yamaha Heritage:
Yamaha Motor Company has a long and storied history in motorsports, renowned for innovation, performance, and reliability across various racing disciplines and recreational vehicles.
Ttr Lineage:
The TTR series represents Yamaha's commitment to accessible and fun off-road motorcycles. The TTR125, introduced around 2000, built upon the success of smaller displacement trail bikes, offering a step-up in performance and features for a wider age range.
Variant Differences:
The 'LW' designation typically indicates a 'Long Wheelbase' and often larger front wheel (e.g., 19-inch front, 16-inch rear) compared to the standard TTR125's smaller wheels (e.g., 17-inch front, 14-inch rear), providing better stability and accommodating larger riders.
Production Period:
The TTR125 platform has been in continuous production, with minor updates, since its introduction in the early 2000s.
